Permit revisions are needed for a variety of reasons including changes to route, equipment, moving date, incorrect information, dimensions or new weights. The information on a permit could change for a variety of reasons, such as a piece of equipment being repaired, replacement of equipment, construction along a route, the shipper miscalculated the weight or size of the load, etc. Generally, permit office errors and equipment changes such as truck and trailer information can be revised. Some states limit revisions to items that do not change the route, weights or number of escorts. Several states require the permit revision to occur within a certain timeframe, ranging from 30 minutes to 72 hours. States that allow revisions for and reason including on a case-by-case basis were placed in the yes category.